Twitter Inc’s first hire for its Canadian office, who in three years time advanced all the way to the vice-president post in charge of the social network’s North American media partnerships, is leaving the company.

Kirstine Stewart, a former CBC executive who also did turns at Alliance Atlantis and the Hallmark Channel, became the managing editor of Twitter Canada when the company opened its doors in Toronto in 2013.

Tech website Re/code first reported the news.

Stewart told the Financial Post that she will remain with Twitter for “a bit yet,” and will have more to announce in the future.

According to her LinkedIn profile, Stewart is responsible for Twitter’s North American media partnerships television, sports, gaming, talent, music, fashion, news and government. Just this week, the social media network has been broadcasting the U.S. Republican National Convention on its website in partnership with CBS.

Stewart also last year published “Our Turn”— a reflection on her career in business and women in leadership in the style of Facebook COO Sheryl Sandberg’s 2013 book “Lean In.” She joined the board of Canadian sports and esports app company theScore last month.

Twitter’s media team has been hit by a barrage of executive departures this year. Katie Stanton, once its VP of Global Media, left in January and her successor, Nathan Hubbard, left only four months later. The head of North American sports partnerships, Danny Keens, and the head of TV cable partnerships, Joanne Park, both left last month.

Twitter has been the subject of much financial and political debate in recent months as its business side has grappled with a static user-base and continuing losses while its content side has been criticized for failing to protect users from hate speech and online harassment.

According to its fiscal fourth-quarter earnings for 2015, the company had a net loss of of US$90 million on revenue of US$710 million. That did compare well to the same quarter the year before year, as revenue grew by 90 per cent and net losses shrunk by 27 per cent.

However, Twitter’s active user base held firm at 320 million, which pales in comparison to Facebook’s 1.6 billion and trails competitors Tumblr (555 million) and Instagram (500 million). Twitter’s valuation has also depreciated precipitously in the past three years, hovering around US$10 billion in 2016, well below its 2013 high of US$40 billion. That puts the publicly traded company’s valuation below private market competitors Pinterest (US$11 billion) and Snapchat (US$20 billion).

A Twitter spokesperson confirmed the departure, but declined to comment further.

Correction: This article originally stated Stewart had joined the board of sports network The Score in June. In fact, she joined the board of the sports app company theScore.

The European Union’s General Data Protection Regulation, or GDPR, has some North American companies so worried about compliance that they’ve temporarily suspended the accounts of 500 million Europeans.